Old hair?

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sara x

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Joined
Jun 6, 2011
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Bit of a question for hair experts about grey hair. I am a skin specialist so fairly clued up on the "ageing process" but not really with hair.
What is it that causes a hair to suddenly become grey? Its not a gradual process obviously so what causes a follicle to suddenly lose pigment and go grey. Also I assume that once a hair has gone grey that follicle will only ever produce grey hairs?
I am blonde and seem to be sprouting an ever increasing number of greys and would just really like to understand the process.
Thanks so much!
 

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